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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2298e7f7c2124ff0e5245dc61cdd36f5551d4197cbf0f342924d6197f3a4b614' 
  AND token = 'Jgo97fN9kkH+23L8EHkqDPC06YuJ60LIrcAA7/SOtMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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