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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb2e2888671d2fd06a416393f3f07ea4b8626608a9dfb1676504182315d19a7' 
  AND token = 'vdDJaFCu7iz0/25Y/jzcJhsA1FhDuiKhdijvzEvQ4f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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