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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c330dc8c98850fd222579031a6e0fc3862f18ce72f52102f7f2c1faecc2e3b20' 
  AND token = 'AQGNkiYDMQgYpFZj3IyMtUs8H6CA2WVGsN48czpwBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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