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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf68f29c79896f79452d3e62c714dc63e10bced0bc86432716e00ed54f7555a' 
  AND token = 'S5sZKJ5XdwmdmDVsS9ATTiqgyFjyDR++tbw2Qn4AHMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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