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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e71523caa7a3c71ed37a29cf93229d83d06121c8d9dfb3a872aff2800afcc57' 
  AND token = 'KphyRYbOLRum/LInieJyCFvzruF5TvPXkochBa9+xvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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