SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83da7af7e2c2b2c5667d10e149d7dd6eb9e72e8bd322144396da8a4fd4c3d82' 
  AND token = 'qcoUgmtlVLKjA25q+vdBcU/RjKzoovqOtPWS90pXBaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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