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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54c5df212ab17d777f75601940638b0d8cdeb590db89333dc437528f49490f2' 
  AND token = 'agOkPo9FAt/rSxKYLPUcFNUu4UxsIKcPAdLD+J6S17I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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