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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86d00639fde4943b9f9a84d9fd42042b860ddb7a7ffd10ea5bf651092b3ef1b' 
  AND token = 'QH4PMQGMIdni3bnVY6678KjWxRuLakrv6cx9Oh+Ncno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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