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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b33806c19f690ee11f83265872b7c0a5f4a6af610c20dd201ec46eced88d992' 
  AND token = '7KmSP7vGGu5YTo9yL0F6cgAR7Z9bwS+SHutpv9m7800=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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