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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be605e512723d60cb7e631a0a17b75321f33a539548fd373ebb11bb03637275' 
  AND token = 'BHUnTeF2/eHERGrG4QjFnRM4gVilzfJ/WgP02UsAYGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}