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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fc888289785e1f31fa64e68510019d5f2a985917c5afb926ba28dd1e2e4f26' 
  AND token = 'yiYQr/ZfI347emlpZckg3kMTaqcfk+Z3Qr7SeEJFvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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