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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5bdb0ee08d818ccd83de07bc3a0eeca081019fa84b46bbf310c6c655b5fef3' 
  AND token = 'sUEyFeqRsMPrIrbfzu+3BWTacLb1LKsxWUeG2C/B0Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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