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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699d51ec466136c0adcb829c079f9818711f2566e286e4ae36d16dde84fc071d' 
  AND token = 'fqxK4X+Cd9HH9meqNuR7ftp3B/lc8BK17yTi8i4xUPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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