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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1456ee98e7add75a8fae0b139d9543d4e94fc8d02bb2e7761e3848921cb1020' 
  AND token = '1+5KIkNl8Unv/FzNo/6mhlHLzw4U9K7kVO8V7IJpP28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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