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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea57f31951d16b0d93740e171595fe892cb0f94fedc574759899800088b77a4f' 
  AND token = '3SIt4xlDLY3Hz0EAzdKwp4e1PAe9rLV9rOLwkydFJQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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