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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8892aabe160b475b22d2672e8436c2edce93010fd602c464ca66e8c4e5ec357f' 
  AND token = 'CAfqLlHrkMt+mRaofWmcfoQ1xr3wICpb38cq1CdTGrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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