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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c83b723c667dbed23be3729333fad9b7164e04d5c545914681fe54d80ca15dd' 
  AND token = 'Hk2orUe98ddHWMpTEpjEvM7iaKTiLzsKOIPDf/P6Evw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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