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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d69ab57a3949f1c526eb07c0ae1437c191144a17518a600bfec8c17cae32e09' 
  AND token = 'EHSzbG08KcbEtNbUIXkOZPuGnPWuwM7MjpY+gtLDjPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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