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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0ec098a6fd9c762e7eab68f5705d4e8fbd4ffa8452a485604a7fd76fcefd1c' 
  AND token = 'D8kJD9si4o7ZP33G0B+8mtXT71+xnrU/tyGxtNyj9JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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