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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a392d1a8650ad652f9fcff8b16267ef1db3e16f8ceb82f2689dc5728596052d' 
  AND token = '3Iqm25Ww3wSceZso9fjg3i1i2CIsyLLI3W8dZE4S4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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