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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8c13c06c41630dfc11dfe168bc99e4bc98b6b8590e3fbb328f34a0fbe52bc3' 
  AND token = 'Jq4ndhG5l191Zhp4Y9D3x6qEOvnlnV86bxT43rAIRnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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