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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ec24d02cc7e5f0c37f4f34e9e529fffb720753fb1eca57f3dec4e3a6372441' 
  AND token = 'lq8WJPhHULmsnwbElcwKbIFNAXZpMD/ncMYzBkqHfeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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