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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4a84813ac3f81b66f5d417366192e01489468b554072e05286fc75d02aa74c' 
  AND token = 'UHTtzfxmDwVIWlEJZHE0dOgj1D8HU15Tiftqz4njOLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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