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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1f3fad64f50356b5152dffbc241ef4252c5531d363c5399aa03e6e02af7767' 
  AND token = 'zX9qtp4m6js3lZvhqf0JcIpY9k930AUkvj3B+ubr9L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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