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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd7b04d67ea6d6063f438c084e56c1625546c57765ae0f963bb3456e20f77ed' 
  AND token = 'kOxajRpXC2WgT4s1HkWVn6HDPbqVPJWjd4BxABsDz9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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