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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60ca91d6ad44aabf11740cb96089ef631442ea5ac6a1c84f353bb75082b6f75' 
  AND token = 'JIIe4UIqEmX84y3aFzjELk0yBuuXmN1IGnQ7G4s6Nvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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