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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e89936b59e62acde5e98e43422be5a8df5212ae72e6bd649d3e4a6aaddecb9' 
  AND token = 'Uw1IRRBiu6AWXpquF7HmlUDKrgld8PwGSl6v1TBh4E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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