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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58f7be5d4c573a45680d424eca1ee21779d57b9e88ae4161c9f4b8babc6d9af' 
  AND token = '0RmdnoPA6MYfgAxpRilhUF7N1V/2wMvIpLG6RKurA9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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