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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd289ae3ada797324ca515edada7ecf499a4e6831f306801630176afe427a59cc' 
  AND token = 'Bb3UVIO6/yr5doY4iOwDB1WnBo2pTZr/9weITDQp+wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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