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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62244e710ad35d2dafbb9749b6a5a6ee829d3d09da0ff848094d9c12593816e4' 
  AND token = 'zn1/+KUqpPRZ2X316v7bSNvORqoB95QXtr3PA6p+stM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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