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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42998bf063eac662d5fe65378ce28c8c5edb9d89ca5f5c8ebd723ed6698b2d67' 
  AND token = 'vRyJI2TfXSy7K5JTa60YE+GtNb4vsuwzRKWi5S6rnPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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