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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d9dc387d2619aeb5c7743610a4a87a4611f21c425145a3111015cf5abbcbe5' 
  AND token = 'cPfMvJjVJEoXiCqFeRJ7HEf7B1KEnJSJFk9z6Fczn0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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