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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a716e83ff5d58087a653f6039c6d72edf9dba92cc94ca5294c1a57ec720a8ed' 
  AND token = 'ZVk4NvLRRC4i3mlscdSz2nxEFGIh0DuFpgXN4aqivV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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