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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19edf548986963e64458874bca837ac9ec5f15f94823c458ad6827db6a523414' 
  AND token = 'RpTfqFq0e/9++/lff7frGHESeMqocdh9mg08TGj+pCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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