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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96846841b40a538ad20e65906c4dd7c9a1f45489c54897fa5480284cb0ab3eea' 
  AND token = '5BQuxEE0XDNHOI2f5eb3Y5AxclE0OYwOSyRNYCNTgaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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