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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1924183390c3af7bb0930d1d9256a2f2854ea49b428b470c2c5c23751e371867' 
  AND token = 'V+O+MXdQiPoW+3oyFK+XnrIxH+ZJiqhpkndEob5M79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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