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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83bfce8a44cf97492605bdb9c1cb99e8888d81eab18a800365ce953aa22af7d' 
  AND token = '9RXOb6RjhppWd2w23APz+BF/6bj+25hecskjUhFyjJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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