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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41eb899c2ef8b709c73d968a2296e5831f6e838942bde0d73edbb316ab4e108f' 
  AND token = '7hD/vmuaZ4PmijxGvn72DFhTs5YclviQ45QrPAfmuvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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