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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cd01990e09089d052148c840ab5ea4137ab9d27f2eff3d09507a34223b5b96' 
  AND token = 'yZgAB1JgpA+dCus5XTMVhAoa8a3FYeMhNXg01Fg+t70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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