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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1dbe8414858e06add2218cef0ae3a41226babe6bfaf378b066885ff8ce3b4f' 
  AND token = 'P7OqyJOVk4ZsoNZC7nfSoXjfIsBi2MzV1A3DF3Zq58M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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