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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b05a73afcba9a38127cbcab0d48c84269054d5b4816bca052f2cf2b95ab9d8' 
  AND token = 'RF0lEoOoNC5LJwaaCK5q6atexT84TVBD8dHDHw17mAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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