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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8740b440f2bf4e8ee1ff2860ce55fe625e183a219729a27e24a9aadca27c18cf' 
  AND token = 'FiJwU6WWfdWo29cQmeKFqKJHHaomzu0wMy25CCliFfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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