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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d178f98290c7b3713aa239842ea853b6123199fa969fca0edadd765a73893d' 
  AND token = 'J5a0k3tz+eVLuEy8zxmBSqbYhk4ZQfyEgPxBzNlZC3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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