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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df4ee7c49eff246e2839977c3df2adbd4e87370741bdf77cc5d26ca327fe20e' 
  AND token = 'gBHsbwFP4WbHyJygz+zuXmQxUsBsRS9wbbzdOHhVxQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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