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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e4bb020ab0d4a04a82aa018b53056d9e0d153a8bcf6350ffe93f1eeb087cdf' 
  AND token = 'jDkFl+Deh9QqZtCNcPlyt0eioXSCX2oFJt8QTlnqDCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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