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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc62112e9daa77aa95bd3a82c2a8877f629bb2421104ca88142537bbd7ac9e24' 
  AND token = 'SgNHLVqqhqo0nsLr/y1JouQttZO63x6BoG3lr76JcVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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