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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98afd143d6ba1e0ad3d74eada975bc49d274c88a9d90c8ab6369a56ab0c9f37c' 
  AND token = 'xwFDz/olHLxmbwwGJNtSthoSpa8AwNDaBZ0+C2wW8SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00308

JSON explain

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