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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5d7490c401fece10456761af08b59b25b1bfaf54e6ce066c5d5b09634b92d4' 
  AND token = 'UDYEkY5xR7lG/rauO8ZttQTc1WAyfO/H9ZEYaoEqUCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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