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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9bce0cf1362c8a37185e01dbbd3d28bbbafd9ef25287c74f27bd1214dbc924' 
  AND token = 'vI1Zc24uD/8i79Hy4L7gOrJg6P9I7rZQQKV7PJUeQxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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