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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0572e80f2d16cc01ab1d5ff2095e3653c58bb886f57f90609dcbce718a88e1e' 
  AND token = 'fOhPdFAm4VsueHiw8qas6Rzff6t9aomg0KaFgAbtz0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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