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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2347dab2e8ac98a592066064a6c41711d5a4ebc764205dfc6b12fe754208a1a8' 
  AND token = 'iszhkFU46q8yPaxPuXezUS51oUdx3PrgdiA72mWJF1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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