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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1cd57d020612febcdaf436ef8e2175ac545c69d031107338a4321444385bb5' 
  AND token = 'liQ35zaDlA15YPQ0vbHA6A3RokDVC0fslgPe5QtLdWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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