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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b8c1cb9c60620be933e70dddbba86d26c7be7ea3bef4589847d43cce1ab217' 
  AND token = 'TxNVzXOKg5683WC5Q+x+geoVSr+cr6v04+sov0DZLEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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