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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8838075a3a9a9284e22b916c08ba6fd864cfddda38eb46069f58790303c115' 
  AND token = '6iN/8+qoWdF8mThCWVvxqE36Ash0JENPIRkkZMQaJfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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