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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912a2329257e8ec6ef9d5bf7828e4b6d032d57ebc3c0ea22de148f5add8ff743' 
  AND token = 'umo0NAKAjAXiSZZYTwV7KmlA3p66TWYb3wK4GB4oukA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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