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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba9fb5a3130e17cbcc3678e81aa9a79576f5ff5ba51dadd50673243e8b58284' 
  AND token = '8TRo43Hvf9d+YTbUraY22CHQbyo9xcfccZyhPY69IMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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