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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf1b9c08a0068a781cce8f280e21beb99122fe5b81940bcb8a6bf4d12945dba' 
  AND token = 'Rvj9wjer1eL1jU02CapHIXJQsfxGMGbOQAa/v4B4B1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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