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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7e2e6e22b54668e0e269e124763994da35c290b106d82a21ccda8e665db5ae' 
  AND token = 'MbhqZQP+DQJn4hAWvWUZMRThu6m2H5HBV2Hist36O1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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