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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5229031bbe6feca68f20bc3366915cde7f60f2a748fc81c129bcfd656c2c8954' 
  AND token = 'hL/a7xXa+BrFV2089FInheAENVRfJsL1kTSxEzNwu10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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