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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577abf4eb3b456206b84c106e8de99048cd949bb7bc147cd1bcb9f32cc28284f' 
  AND token = 'MAFazp1cSqhkCH1+r5FgFVITQd/ooRgFLC3/XSto7hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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