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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acdf5bb5be5f79c86c1ecfa63352af4f81230c0710030c97694555a44c09911' 
  AND token = 'fKVMdWY7Sc4jNm2K/m//3o8QvEqWvsq4/ZO0pTxtdWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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