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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8746ba3bb2048b45c5d8097d0f2fc55402b208444c4ecf837076a47b7e3d302e' 
  AND token = 'XtdJHIcR7PpZt8RBpDixXLK+NRHlcEJ21XB739exhNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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