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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ff240416ecb40a2fbb15dac4c713c0492079ceee20ff08cc7f7b496f00cd91' 
  AND token = 'pynEAvxYhEFgo+Di5qf5VINYejFCGS0Q6ARA04YLEzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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