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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f19f03f6f56dc811560e09d176edc1f146e614aa98d73675237cbd8b79eaf5' 
  AND token = 'ECoWVx+uaz77CdbvC1aDimbOT0q+vCrQWlj88mYzk7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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