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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae96d9808ebda8229aab53fa44efb9f7786a001c3048533d07865e168c94226' 
  AND token = 'tr/9lu6mX9tDYPmxAFJUgfthl59SZGZy3fPCeS5Ky08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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