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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9b198aec55fff4554e2dfe6e86ae60f5058b28bba68c9d0f85b7214906a6c2' 
  AND token = 'ZP+KuXQDO+Hl/4CYFuRO5shb5FMFb0uY6i5qN0C6sAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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