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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c9bf8750e8fc64c1d061c9609213a2415b81d6687b562e2e388ad5da0fa9a0' 
  AND token = 'V2zJieR6O2H+gpGIoDuHf3078L+/uO4xSP+n2HaPNqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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