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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a11413f8a812a2eb9f622cd1bbe10532bad082739ed95e9ce39288b2700a70' 
  AND token = 'W1NU0uM8FrazM8DozcxXF+ikUSkdTIcDT3ONzIT4O8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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