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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e56db112ff526d610eb6edbd369352d4620fd3afaa0610356d533a841125471' 
  AND token = 'OairCbyfj5gFY4htNPIgaZDJ1Z3Pdp0Tli7jfEFcJWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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