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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb975c9d4eaa4f6bf1760ca39a06d1276db5c33563c27a4798eb286a0b4abcb' 
  AND token = '3/9mVJRuiu/b0YFRK+gll7TMSitG+naN7LgqL542hlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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