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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f23e9e1c4bb12c6494e100a2abfe5f31b66e2ed9f76b9ec07e51c7cf64d345' 
  AND token = 'FIK7C4VjYE/lpvttYHOHJxeDo1O6Xn/yj6qtfwoEE10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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