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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029394054d90949019034e01d6d54c9d4ec0347eb46e103f1ff0056af798168f' 
  AND token = 'gPY2iBWJU58PgVu4hX3yiUY3shtrTQy5gStcI5kzeEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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