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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f463c7c8a126241da9b59b4b5a7a38b1e61a989e11f09d7a1e4a73ee3558dad' 
  AND token = 'V1rmfG1gZuqgwNgqux9pDERlVsH8hQlftyF4/ewhXd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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