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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d716d438ee0a80f855bffd454248354dc637a853a31ae743aded0e96f23086f' 
  AND token = '3mie71miOr5383tOO5fvq+wd6dFmPZD/35W5YHlXDSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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