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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411fe69f7ec7d1fea3ddbfc80d1e0948364cc3c58425c7626d2ecc406ac0cd1d' 
  AND token = 'NwFoT49imG0eN1L/1a/WSclMR1Da0yiEaMM4Jm7fJA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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