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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe5421cc177b51e987b3bd0e3e560b8f88911944a3c313bed64aed872670bed' 
  AND token = '+FmNJph4x/BFEyp4EAtQIjatC5zcOYfuTTk0DkYgV4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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