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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad01edb7f3139c15afc540786df91b9df3bdfd3ba52d08c42f744a5b5636905f' 
  AND token = 'RxFnErmUNR3kFuqqD32X8SYfVczXY7ayL7ryBWjyO2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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