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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f21586ca1bd20851622d5d52ea88aa6477baf50e97ee334631998458127d64' 
  AND token = '9IR01Yuh3hZ1YrGv7CfD2OcFrm/OlwTaLom38ZMUrgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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