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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fc3a1d7c9ea552a3347490f4c9b41794a77a02ddfffb7530c98051e21aa316' 
  AND token = 'H8+ywcjRfi2i/H5sBWN+6IMXzT4T7qqPllNEf9hNkog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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