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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a03b27d85ae9180d84f0c8955a9a429cc02cdb3530c7dab8ec59a6cc0949c18' 
  AND token = '1DRGmOfZ07eIuyfP1DfQXQfD7JRXQUZv2PnrvYOw4P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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