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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185b98e216f8714cd676d58aee869939f545df2a1a1f8ac1ad00a172bb08620d' 
  AND token = 'Q4EhYFTRRnIK96lOLTT0Wkmsd8WZHyqr/pHfaK87bwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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