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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c864ba1fd18f8ebd72706e719efb0da4fe0e0407ad9cecd817d9778f35df20f7' 
  AND token = 'rWrZ5PN5lyeDA/PamnzPOBiTptVe3hZUTWSs05Q+f3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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