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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2734360fd0842bc5fa1c645c94d3b4defda682244b79d2b692c9815b3814d9d9' 
  AND token = '+SwBf27Sh27P+38DvnHufTjlVP8YB6rHH975eDCpErY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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