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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692b0bf6211cef9f884770928dd978e94f6cf91fee3d66e615f6ced72019aa4b' 
  AND token = '7Suaw2ByCaz9d/UVKwWQYz1eeG9nSFYu7m+G670L9kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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